Add recursive-research skill (#718)

Co-authored-by: Anjos3 <81331445+Anjos3@users.noreply.github.com>

README.md

@@ -146,6 +146,7 @@ Claude Skills are customizable workflows that teach Claude how to perform specif
 - [CSV Data Summarizer](https://github.com/coffeefuelbump/csv-data-summarizer-claude-skill) - Automatically analyzes CSV files and generates comprehensive insights with visualizations without requiring user prompts. *By [@coffeefuelbump](https://github.com/coffeefuelbump)*
 - [deep-research](https://github.com/sanjay3290/ai-skills/tree/main/skills/deep-research) - Execute autonomous multi-step research using Gemini Deep Research Agent for market analysis, competitive landscaping, and literature reviews. *By [@sanjay3290](https://github.com/sanjay3290)*
 - [postgres](https://github.com/sanjay3290/ai-skills/tree/main/skills/postgres) - Execute safe read-only SQL queries against PostgreSQL databases with multi-connection support and defense-in-depth security. *By [@sanjay3290](https://github.com/sanjay3290)*
+- [recursive-research](https://github.com/Anjos2/recursive-research) - Recursive research up to PhD level across any domain (science, tech, business, arts, humanities) with source tiering, WDM + Munger inversion for autonomous decisions, and disk checkpointing to survive context compaction. *By [@Anjos2](https://github.com/Anjos2)*
 - [root-cause-tracing](https://github.com/obra/superpowers/tree/main/skills/root-cause-tracing) - Use when errors occur deep in execution and you need to trace back to find the original trigger.
 
 ### Business & Marketing